Why does it hang?

Code:

---

#include <stdio.h>

unsigned int gcd(unsigned int a, unsigned int b) {
        unsigned int t;
        while (b) {
                t = b;
                b = a&#37;b;
                a = t;
        }
        return a;
}

void inFlush(FILE *in) {
        int ch;
        while ((ch = fgetc(in)) != EOF && ch != '\n') {
                /* f l u s h i n g */
        }
}

char *skipSpace(char *inStr) {
        while (*inStr == ' ' || *inStr == '\t') {
                ++inStr;
        }
        return inStr;
}

int main() {
        char buff[1024];
        char *p;
        unsigned int a, b;
        while (1) {
                printf("Enter value for a & b (q will quit): ");
                fgets(buff, sizeof(buff), stdin);
                inFlush(stdin);
                p = skipSpace(buff);
                if (*p == 'q') break;
                sscanf(p, "%u %u", &a, &b);
                printf("GCD of %u & %u is: %u\n\n", a, b, gcd(a, b));
        }
        return 0;
}

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This program just hangs even when I enter 'q' just after running :(
Edit: it needs two <enter>s in a row to run further.

I fixed that myself.

:)